The burning of coke on Pt Re/Al2O3

C.L. PIECK; E.L. JABLONSKI; R.J. VERDERONE; J.M. GRAU; J.M. PARERA

CATALYSIS TODAY

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 1989 vol. 5 p. 463 - 472

0920-5861

In order to follow coke burning on a Pt-Re/Al203 catalyst commercially coked, several experiments in a bench scale equipment with an isothermically-operated reactor were made. The influence of the operating temperature, pressure, and flow rate on CO2 concentration in the outiet gas-was studied. Comparing the results and photographs of the radial coke distribution durinq the burninq, a model stating the presence of several types of coke with different degrees-of polymerization was proposed. Experiments in a Differential Thermal Analysis equipment were carried out in order to determine operating conditions under which the ignition of coke burning reactions takes place. It was found that the exothermicity of combustion of the hydrogen adsorbed on the metal is important in initiating the coke burn-off.